The following is obviously just an opinion, mine. I don't think most riders can easily differentiate between the same type of frame materials made by the various manufacturers(columbus steel vs. reynolds, etc.) or between steel "varieties" from the same manufacturer. Blind side by side test rides would be great but thats not going to happen. I'm not saying you(this is a general you, not specifically you) can't tell the difference between steel, alum, carbon, light or heavy tubing, but within the same type of frame materials(and design parameters) most folks would be really hard pressed to notice a difference. No one can tell you how a particular material will feel to you. What they can tell you is how different materials react in response to the loads and forces placed upon them. The only way to determine how a frame will feel is to ride it in the configuration designed as you want it under conditions of intended use. I think you have to ride a frame material(in this case different types of steel) for a minimum of 100 miles or so under the conditions it was designed for to develop a feel for the ride; loaded touring, commuting, criterium, centuries/casual riding(not that all centuries are casual), etc., and even then it probably would be tough. This most likely doesn't help you a bit, but while others may offer general guidance you need to decide what is right for you and just go for it.

good luck,

Brian